package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetMealDishMapper setMealDishMapper;
    /**
     * 新增菜品和口味
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入一条数据
        dishMapper.insert(dish);
        Long dishId = dish.getId();
        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors !=null&&flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     *分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断是否存在起售中的菜品
        for(Long id: ids){
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否被套餐关联
        List<Long> setmealIds = setMealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds!=null&&setmealIds.size()>0){
            //存被套餐关联情况，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

//        //删除菜品表中菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除菜品关联口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //删除菜品表中菜品数据
        dishMapper.deleteByIds(ids);
        //删除菜品关联口味数据
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品表
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询关联口味
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将查询到的数据封装到DishVO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 修改菜品
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateDishWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表基本信息
        dishMapper.update(dish);
        //删除原口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //插入新口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!=null&&flavors.size()>0){
            flavors.forEach(dishFlavor->{
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品起售、停售
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        //判断关联套餐是否起售，若有，则菜品无法停售
        if(status == 0){
            List<Integer> statusArrays = setMealDishMapper.getStatusByDishId(id);
            if(statusArrays!=null&&statusArrays.size()>0){
                statusArrays.forEach(statusArray->{
                    if(statusArray==1){
                        throw  new SetmealEnableFailedException(MessageConstant.DISH_STOP_FAILED);
                    }
                });
            }
        }
        //停售菜品
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        //根据分类id查询起售的菜品
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 根据分类id查询带口味的菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Long categoryId) {
        //根据categoryId获取dish信息
        Dish dish = new Dish();
        dish.setCategoryId(categoryId);
        dish.setStatus(StatusConstant.ENABLE);
        List<DishVO> dishVOS = dishMapper.listVO(dish);

        //获取口味信息
        dishVOS.forEach(dishVO -> {
            Long dishId = dishVO.getId();
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(dishId);
            dishVO.setFlavors(flavors);
        });
        return dishVOS;
    }
}
